Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
  • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
  • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
  • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
  • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
  • F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N13/00—Exhaust or silencing apparatus characterised by constructional features
  • F01N13/009—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
  • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
  • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
  • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
  • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N9/00—Electrical control of exhaust gas treating apparatus
  • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/02—Circuit arrangements for generating control signals
  • F02D41/021—Introducing corrections for particular conditions exterior to the engine
  • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
  • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
  • F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/02—Circuit arrangements for generating control signals
  • F02D41/04—Introducing corrections for particular operating conditions
  • F02D41/12—Introducing corrections for particular operating conditions for deceleration
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D2200/00—Input parameters for engine control
  • F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
  • F02D2200/602—Pedal position
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/02—Circuit arrangements for generating control signals
  • F02D41/04—Introducing corrections for particular operating conditions
  • F02D41/045—Detection of accelerating or decelerating state
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/30—Controlling fuel injection
  • F02D41/38—Controlling fuel injection of the high pressure type
  • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
  • F02D41/402—Multiple injections
  • F02D41/405—Multiple injections with post injections
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/10—Internal combustion engine [ICE] based vehicles
  • Y02T10/40—Engine management systems

Definitions

• the invention relates to a method for controlling the regeneration of a pollution control system placed on an exhaust gas evacuation line of an internal combustion engine.
• One field of application of the invention is the depollution of the exhaust gases of motor vehicles, in particular diesel.
• these systems operate discontinuously or alternately, that is to say that in normal operation they trap pollutants but only treat them during regeneration phases. Thus to be regenerated, these traps require specific modes of combustion to ensure the necessary thermal and / or wealth levels.
• Regeneration of the particulate filter used to trap and then remove soot emissions from the engine, requires an increase in the temperature of the exhaust gas to trigger the combustion reactions of the trapped particles.
• This phase is generally performed by means of an injection of reducers in the exhaust line, either through a delayed injection into the cylinders called post injection, or through an injection directly into the exhaust line by an additional injector.
• the reducing agents will react in a catalyst placed upstream of the particulate filter with the oxygen present in the exhaust gas according to exothermic reactions.
• Injections cuts can cause particle filter runaway when a regeneration phase is in progress. Indeed, the sudden intake of fresh air in the exhaust line and a sharp drop in engine speed strongly favor the combustion of soot, and the heat released during the reactions is very poorly evacuated by the low flow rates of the gases. exhaust due to decrease in engine speed. The temperature of the filter increases sharply, preventing any control of the combustion reactions of the particles.
• Document FR-A-2 860 837 describes an exhaust gas purification system intended for an internal combustion engine, comprising: a filter placed in an exhaust duct intended to collect the particulate matter contained in the exhaust gas; 'exhaust,
• a catalyst having an oxidation function said catalyst being provided in at least one of the state supported on said filter and of the state disposed in said exhaust duct upstream of said filter, a regeneration means for filtering, when the amount of particulate material deposited on said filter becomes greater than or equal to a specified amount of deposit, increasing the temperature of said filter to oxidize and removing particulate matter deposited on said filter, and
• a heat quantity estimation means for estimating, when the operating state of said internal combustion engine goes to idle operation, while the particulate material deposited on said filter is oxidized and eliminated by said means filter regeneration, the amount of heat removed, i.e., the amount of heat carried with the exhaust gas until the operating state of said internal combustion engine enters an operating state at idle, from the amount of heat generated by oxidation of the particulate matter, based on the difference between the number of engine revolutions at the start of idling and the number of engine revolutions in operation at the engine.
• the regeneration is stopped when the measurement of the amount of heat removed exceeds a threshold value, and the amount of oxygen arriving in the particulate filter is decreased by an increase in fuel injections when this amount of heat is below this threshold.
• Document FR-A-2,873,164 describes a device for preventing overheating of a filter intended to purify an exhaust gas emitted by an internal combustion engine, in which the filter filters particulate matter in the exhaust gas. exhaust, the particulates that are accumulated in the filter during filtration are burned and purified by performing a temperature increase treatment in which the filter is heated, the device being characterized by an overheating prevention means, wherein during the temperature increase process, the overheating prevention means performs an increase processing to increase the flow of the exhaust gas when the filter is likely to overheat.
• This known device uses a strategy of increasing the flow of exhaust gas, controlled by a quantity of air admitted into the cylinders, when a runaway is anticipated.
• the invention aims to obtain a regeneration control method, using a device for cooling the internal temperature of the particulate filter, to better control the runaway thereof.
• a first object of the invention is a method of controlling the regeneration of a pollution control system placed on an exhaust gas evacuation line of an internal combustion engine, in which, to perform said regeneration, fuel is injected into the exhaust gas upstream of the pollution control system, and wherein at least a first sensor detects the position of the accelerator pedal and at least a second sensor detects the temperature in the line of d exhaust gas discharge downstream of the pollution control system, characterized in that a fuel injection control in the exhaust gas upstream of the pollution control system in excess of the oxygen is activated whenever the first sensor has detected a deceleration of the accelerator pedal, and is deactivated when the second sensor detects a temperature below a prescribed threshold for detection of runaway of the pollution control system.
• the fuel injection control in the exhaust gas is performed by at least one additional fuel injector disposed on the exhaust gas line upstream of the pollution control system;
• the fuel injection control in the exhaust gas is performed at least by a delayed injection of fuel in at least one combustion chamber of the engine;
• the pollution control system comprises a particulate filter;
• said fuel injection control in the exhaust gas upstream of the pollution control system in excess of oxygen is activated with a quantity of fuel injected sufficiently large so that the majority of the fuel injected remains at the liquid state in the exhaust gas line.
• a second object of the invention is a device for controlling the regeneration of a pollution control system placed on an exhaust gas evacuation line of an internal combustion engine, according to a method as described above. , characterized in that it comprises at least one injection device for injecting fuel into the exhaust gas discharge line upstream of the pollution control system, at least one first sensor for detecting the position of the pedal engine accelerator, at least one second temperature sensing sensor in the exhaust gas line downstream of the pollution control system, means for controlling the injection device to inject excess fuel by relative to oxygen in the exhaust gas line upstream of the pollution control system, the injection control means being responsive only to the first and second sensors, to be ac due to the fact that the first accelerator pedal position sensor detected a deceleration passage thereof, and to be deactivated by the fact that the second temperature sensor in the exhaust gas line downstream of the pollution control system has detected a temperature below a prescribed threshold for detection of runaway of the pollution control system. According to other characteristics,
• the fuel injection device comprises at least one additional fuel injector disposed on the exhaust gas line upstream of the pollution control system; the fuel injection device comprises at least one fuel injector in at least one combustion chamber of the engine.
• a third object of the invention is a motor vehicle equipped with an internal combustion engine, an exhaust line of the engine exhaust, on which is placed a pollution control system, characterized in that the vehicle is equipped with the device for controlling the regeneration of the pollution control system as described above.
• the figure illustrates without limitation the application of the invention to a vehicle engine.
• a four-cylinder internal combustion engine 1 comprises an exhaust gas outlet 2, connected to a line 3 for evacuating them.
• the engine 1 is equipped with a turbocharger having a turbine 4 interposed between the output 2 and the line 3 and a compressor 5 interposed on the intake inlet 6 of the engine.
• the exhaust line 3 comprises, successively in the direction of evacuation of the exhaust gas from the outlet 2, a first section 31 on which is an additional injector 6 of fuel exhaust, said
• the oxidation catalyst means may be, in one embodiment not shown , an oxidation catalyst material in the particulate filter 8.
• a temperature sensor 9 on the outlet 2 upstream of the line 3 and the turbine 4 an oxygen sensor 10 on the first section 31, a temperature sensor 11, T efap of particulate filter inlet on the second section 32, and a differential pressure sensor 12 for measuring the pressure difference between the inlet of the filter 8 on the second section 32 and the outlet 54 of this filter 8.
• the measurement signals supplied by these sensors 9, 10, 11, 12 are sent to the computer 14 (or electronic control unit ECU) embedded for processing.
• a sensor 51 for detecting the position of the accelerator pedal 40 of the engine supplying its detection information to the computer 14 via a line 52.
• a temperature sensor 53 is provided. in line 3 in section 54 of the exhaust line 3, located downstream of the particle filter 8, and for example at the outlet thereof.
• the sensor 34 for detecting the temperature TsFaP in the line 3 downstream of the pollution control system 8 transmits its detection information to the control unit via a line 55.
• the computer 14 controls the additional injector 6, as this is symbolized by the control line, and also the injection of fuel into the combustion chambers of the engine 1, as is symbolized by the control line 16.
• This computer 14 can also be used to process other information from electrical consumers 17, motorcycle fan assembly 18, a controlled thermostat 19, and atmospheric temperature and atmospheric pressure sensors 20, 21.
• the computer 14 activates the injection control at the exhaust.
• This fuel injection control is sent on the line 15 and / or on the line 16, to cause fuel injection into the exhaust gas discharge line 3 or by the additional injector 6 upstream of the oxidation catalyst directly in the line 3, or by the post injection 43 in one or the cylinders 30 of the engine, this post injection 43 resulting in the delayed injection of fuel into at least one combustion chamber 30 of the engine 1, corresponding to an additional injection therein during the expansion phase of the cylinder or cylinders 30, to pass fuel to the outlet 2.
• the temperature sensor TsFaP at the output of the filter 8 makes it possible to control the temperature drop due to the actuator formed by the fuel injection means 6, 43.
• the injection control performed by the computer 14, is deactivated when the temperature TsFaP measured by the sensor 53 downstream of the filter 8 drops below a predetermined value.
• the internal walls of the particulate filter 8 are thus cooled by a cold fuel injection upstream of the filter 8, so that the fuel is in excess with respect to the oxygen in line 3, which corresponds to a mode of operation. of the engine at a richness greater than 1 or a stoichiometric mixture.
• the cooling of the exhaust gases flowing in the particulate filter 8 is thus faster.
• the fact of projecting fuel on the walls of the filter 8 can lower its temperature during the vaporization thereof.
• the rapid rise in the temperature of the walls of the filter and the gas passing through it is thus perfectly controlled.
• Using a liquid rather than a gas greatly increases the kinetics of heat transfer. That is, the heat will be more easily removed by means of a liquid rather than a gas because of its higher heat capacity.
• the liquid has the ability to adhere well to the walls which allows a better thermal protection of the filter, preventing physical breakage due to too high temperatures. This gives a quick way to eliminate all the oxygen present in the exhaust line or in the filter by the change of combustion mode of the engine in rich mixture.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Processes For Solid Components From Exhaust (AREA)
• Filtering Of Dispersed Particles In Gases (AREA)
• Emergency Alarm Devices (AREA)
• Cleaning Of Streets, Tracks, Or Beaches (AREA)
• Exhaust Gas After Treatment (AREA)

Applications Claiming Priority (2)

Publications (2)

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• 2006
  • 2006-09-27 FR FR0608468A patent/FR2906301B1/fr not_active Expired - Fee Related
• 2007
  • 2007-07-31 DE DE602007004127T patent/DE602007004127D1/de active Active
  • 2007-07-31 EP EP07823671A patent/EP2066882B1/de not_active Ceased
  • 2007-07-31 AT AT07823671T patent/ATE453786T1/de not_active IP Right Cessation
  • 2007-07-31 WO PCT/FR2007/051759 patent/WO2008037901A1/fr not_active Ceased

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